FIELD
[0001] The present invention relates to a fitting for blind systems, and in particular,
a winder spindle cover used with winders for controlling the extension and retraction
of a screen of a blind system.
BACKGROUND
[0002] A winder refers to a user-operated blind component (or fitting) that is rotatable
for, for example, extending and retracting a cover or structure, such as a window
blind. A winder can also be referred to as a clutch device or mechanism. Such fittings
typically have a drive portion that engages a cord. The cord itself may or may not
be beaded. For example, the cord may be referred to as a bead chain, which can be
(but is not limited to) of a plastic or metal construction (or combinations thereof).
For example, the cord may be pulled in one direction to rotate the fitting in a blind
extending direction, and the cord may be pulled in an opposite direction to rotate
the fitting in a blind retracting direction.
[0003] During use, a user may attempt to pull the cord in various directions which may cause
the blind materials and fittings to undergo significant stress as the blind is fully
retracted or extended. When pulled quickly, the beads on the cord also become noisy
as they impact the opening in any cord winder spindle cover which over time may cause
damage or failure of the cover. Typically cords are also provided with stops which
are attached to the cord at positions that represent positions immediately before
the blind being fully retracted or extended. In this way, the stops impart impaction
stress to the cover rather than the blind materials or fitting, and over time the
cover may fail or be damaged.
[0004] It is therefore desired to address one or more of the above issues or problems.
SUMMARY
[0005] According to the present invention, there is provided a cord winder spindle cover
housing, wherein the housing is mountable onto a spindle, and said housing has (i)
a drive portion for receiving a cord that controls the extension and retraction of
a blind and (ii) at least one opening through which the cord passes, the opening defined
by a pair of spaced but opposing convex surfaces.
[0006] Preferably the opening narrows toward the mid-point of the opening.
[0007] According to the present invention, there is provided a winder, including:
- (i) a support member having a spindle; and
- (ii) a housing mounted onto said spindle, said housing having (i) a drive portion
for receiving a cord that controls the extension and retraction of a blind and (ii)
at least one opening through which the cord passes, the opening defined by a pair
of spaced but opposing convex surfaces.
[0008] Preferably, the opening narrows towards the mid-point of the opening.
[0009] Preferably, the cord includes at least one stop having an impacting dimension less
than the opening but more than the dimension defined by the pair of spaced but opposing
convex surfaces.
[0010] By having opposing convex surfaces, the cord, if beaded presents an angle of deflection
to that surface much less than the almost 90 degree angle of impact presented in conventional
winders by beads to the housing. Therefore the impact stresses and associated noise
are reduced which results in quieter operation, better housing integrity and longevity.
[0011] If a stop is incorporated onto the cord, the entry of the stop into the opening means
it is stopped by complementary convex surfaces which reduce the impact stress and
results in quieter operation, better housing integrity and longevity.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Representative embodiments of the present invention are herein described, by way
of example only, with reference to the accompanying drawings.
[0013] Figure 1 is a front view of a cover housing.
[0014] Figure 2 is a rear view of the cover housing of figure 1.
[0015] Figure 3 is a top view of the cover housing of figure 1.
[0016] Figure 4 is an underneath view of the cover housing of figure 1.
[0017] Figure 5 is a left side view of the cover housing of figure 1.
[0018] Figure 6 is a right side view of the cover housing of figure 1.
[0019] Figure 7 is a section view along A-A of the cover housing of figure1.
[0020] Figure 8 is an exploded view of the section view of figure 7.
[0021] Figure 9 is an exploded view of the section view of figure 7 with a beaded cord.
[0022] Figure 10 is a section view along B-B of the winder of figure 8.
DETAILED DESCRIPTION OF THE REPRESENTATIVE EMBODIMENTS
[0023] Figures 1-10 depict a cover housing 100. A cord (only shown in exploded view figure
9) passes through opening 110 and around the drive (usually a wheel type member -
not shown) and then out of the opening 110. By pulling the cord through the opening
110, the drive is caused to rotate which in turn rotates a blind clutch (not shown).
The blind is mounted on the blind clutch at one end and also supported at its other
end by a mounting (not shown).
[0024] Opening 110 is provided with a pair of opposed convex surfaces 120 and 130 (more
particularly shown in figures7, 8 and 9). As the surfaces are rounded, the cord entering
the opening 110 is not presented to a defined upstanding impact face. This means that
the impact of the cord (and beads) into the opening will be minimised and therefore
quieter. Similarly, less stress on the opening takes place which reduces failure of
the opening materials. Likewise, if the cord has a stop (as shown in figure 9), the
impact of the stop onto the cover 100 is reduced as the opposing surfaces on the stop
and the convex surfaces 120 and 130 are more aligned.
[0025] As particularly shown in figure 4, the opening 110 narrows towards the mid-point
of the opening 110. As such any lateral movement of the cord towards the mid-point
of the opening is inhibited or minimized. This means there is less likelihood of tangling
and jamming of the cord as it is biased to run through the opening 110 in separate
defined portions of the opening.
[0026] Modifications and improvements to the invention will be readily apparent to those
skilled in the art. Such modifications and improvements are intended to be within
the scope of this invention.
[0027] In this specification where a document, act or item of knowledge is referred to or
discussed, this reference or discussion is not an admission that the document, act
or item of knowledge or any combination thereof was at the priority date, publicly
available, known to the public, part of common general knowledge; or known to be relevant
to an attempt to solve any problem with which this specification is concerned.
[0028] The word 'comprising' and forms of the word 'comprising' as used in this description
and in the claims does not limit the invention claimed to exclude any variants or
additions.
1. A cord winder spindle cover housing, wherein the housing is mountable onto a spindle,
and said housing has (i) a drive portion for receiving a cord that controls the extension
and retraction of a blind and (ii) at least one opening through which the cord passes,
the opening defined by a pair of spaced but opposing convex surfaces.
2. A cord winder spindle cover according to claim 1 wherein the opening narrows toward
the mid-point of the opening.
3. A winder comprising:
(i) a support member having a spindle; and
(ii) a housing mounted onto said spindle, said housing having (i) a drive portion
for receiving a cord that controls the extension and retraction of a blind and (ii)
at least one opening through which the cord passes, the opening defined by a pair
of spaced but opposing convex surfaces.
4. A winder according to claim 3 wherein the opening narrows towards the mid-point of
the opening.
5. A winder according to either claims 3 or 4 wherein the cord includes at least one
stop having an impacting dimension less than the opening but more than the dimension
defined by the pair of spaced but opposing convex surfaces.